Protracting-square.



No. 718,817. PATENTED JAN. 20, 1903.

S. A. CALDWELL & S. B. TERRY.

PROTRAGTING SQUARE.

APPLIOATION FILED APB. z5, 1902.

E() MODEL.

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UNrTED STATES PATENT Ormes.

STEVENSON A. CALDWELL AND SEYMOUR B. TERRY, OF LITTLE SIOUX, IOWA.

PROTRACTlNG-SQUARE.

SPWIFIGATION forming part of Letters Patent No. 718,817. dated January20, 1903.

Application filed April 25. 1902. Serial No. 104|6SI. (No model.)

To all whom. t may concern.:

Beit known that we, STEVENSON A. CALD- WELL and SEYMOUR B. TERRY,citizens of the United States, residing at Little Sioux, in the countyof Harrison and State of Iowa, have invented new and useful Improvementsin Protracting-Squares, of which the following is a specilication.

This invention relates to a protractingsquare for use by carpenters andothers; and the object of the same is to provide a device embodyingmeans for adjusting an ordinary form of square at an angle and topositively vary the degrees of angular adjustment of said square throughthe use of a protractor ineluded in the organization of the contributingelements, and also to simplify the construction and produce a strong anddurable device of this class adapted for use in performing differentkinds of work and assisting an operator in maintaining and ascertainingdifferent angles in cutting up lumber and in general structureerections.

The invention consists in the construction and arrangement of theseveral parts, which will be more fully hereinafter described andclaimed.

' In the drawings, Figure l is a perspective view of a square embodyingthe features of the invention. Fig. 2 is a detail perspective view of aprotractor-carrying member forming part of the device. Fig. 3 is adetail perspective view of a part of the stock. Fig. 4 is a detailperspective view of the'square proper. Fig. 5 is a transverse verticalsection on the line 5\5, Fig. 1. Fig. 6 is a'transverse vertical sectionon the line 6 -6,'Fig.A 1. tail perspective view of the pivot-pin forthe square.

Similar numerals of reference are employed to indicate correspondingparts in the several views.

The numeral 1 designates the lower stock member, comprising a metallicsocket-plate 2, having a laterally-projecting protractor-support 3 at'one side'with an opening 4 therethrough and a surrounding or marginalflange 5., which continues from a flange 6, extending along the adjacentside edge of the plate 2 and over one end of the latter. Secured to theinner end of the socket-plate 2 is a wooden Fig. 7 is a destrip 7,having a recess 8 in the upper side thereof which provides a iiange 9,alined with the flange 6 and an end shoulder 10. The bottom wall of therecess 8 and the top surface of the socket-plate 2 are iush, and by thismeans the lower stock member lis formed with a seat to receive an upperstock member 1l, comprising a substantially rectangular wooden strip l2and a metallic closing plate or protractor member 13, having alaterallyprojected protractor 14 at one side held by an arm 15, adaptedto it into the protractor-support 3 of the plate 2. The protractormember 13 is formed of metal and has a flange 16 surrounding the edgeand end of the same which normally bears upon the flange 6 of the plate2, and by this means the upper side of the said protractor member isprovided with a seat to receive an eXtension of lthe strip 12. When thestrips 7 and l2 are respectively applied to the plate 2 and protractormember 13, a flushv upper and lower surface isA produced, the severalconnected parts being proportioned in such manner as to arrive at thisresult. The plate 2, protractor member 13, and the strips 11 and 7 areincreased in width adjacent to the location of the protractor-support 3and protractor 14. to form an extended bearing surface or inclosure fora purpose which will be presently set forth.

The improved device also comprises a metallic square 17, having theusual long and short arms and provided with scale-marks Vrepresentinginches and fractions of an inch.

At the inner corner or angle of intersection of the two arms ofthesquare an opening 18 is formed to receive a collar 19 on a pivot orfulcrum pin 20, the said collar being centrally located, and portions ofthe pin above and below the collar are immovably held in the plate 2,protractor member 13, and strips 7 and 1l. The pivot-pin forms thecenter from which the arc of the protractor is struck or delineated, andby the use of the collar 19 the several parts of the stock, includingthe plate 2, with its protractor-support 3, and the protractor member13,v with the protractor 14', are held apart a sufficient distance topermit the square 17 to swing or turn on the said collar outwardly fromand partially into the slot IOO thus formed between the parts of thestock. Vhen the longer arm of the square is held closed within thestock, the improved device can then be used as an ordinary square forlaying out work, and to maintain the square either in apartially-inclosed position, as set forth, or projected at an angle saidsquare at the point of intersection of the arms or near said points isformed with asegmental slot 21, struck from the pivot-pin 20 as a centerand engaged by a clamping-pin 22 passing therethrough and the adjacentportions of the stock and supplied with a clamping-nut 23 on the upperend thereof, which is adapted lo bear against the top of the stock. Bytightening the clamping-nut 23 the square will be held immovable in theposition desired. The square adjacent the point ot' intersection of thearms thereof is also .formed with a pointer or indicator 22, whichmovably projects out between the parts of the stock and extends acrossthe openings in the protractor-support and protractor and has its freeend held under the latter, as clearly shown by Fig. 1. This pointer orindicator 22a cooperates With the degree-scale of the protractor 14, andthe square 17 can be set at any angle desired by adjusting the pointerto the mark on the protractor corresponding to such angle.

From the foregoing description it will be seen that a convenient tool orimplement is provided for the use of carpenters and others in laying outwork and in erecting structures where it is frequently necessary totransfer angles in making similar cuts in different pieces of timber,and also for ascertaining and measuring angles of structures to whichadditions are to be made and embodying irregular positions in relationto each other. It will also be seen that the free end of the pointer isprotected and will be prevented from becoming broken, and when it isdesired to use the implement as an ordinary square the longer arm of thesquare 17 may be held inclosed within the stock 1.

A material advantage resides in the disposition of the collar 19 and thepivot or fulcrum pin 20. While the collar on the said pivot-pin holdsthe parts of the stock separated, its main office is to insure firmnessin the attachment and operation of the square. The collar gives a rotarybearing that retains the inner angle of the square ush With theoperating edge of the stock at all times, no matter in what position thesquare is placed. This is essential in View of the fact that if theinner angle of the square does not remain constant with the plane of theoperating edge of the stock the instrument would be imperfect.

It is obvious that changes in the size, form, proportions, dimensions,and minor details may be resorted to Without departing from the spiritof the invention.

Having thus fully described the invention, what is claimed as new isl.In an implement of the class set forth, the combination of a stock,comprisinga protractor-support and protractor at one side, the saidstock being made up of superposed parts which, with theprotractor-supportand proti'actor, are held in spaced relation, and asquare movably mounted in the slot and having a pointer projectingthrough one side of the latter and the free end held between theprotractor and protractor-support.

2. In an implement of the class set forth, the combination of stockcomprising a protractor-support and protractor, the stock being made upof superposed members, separately carrying the protractor-support andprotractor, a pivot-pin in concentric relation to the protractorandhaving a collar thereon which holds the parts of the stock separated,and a square having an opening therein to fit over the collar of thepivot-pin and also provided with a movable pointer to coperate With theprotractor.

In testimony whereof we affix our signatures in presence of twowitnesses.

S'IEVENSON A. CALDWELL. SEYMOUR B. TERRY. Witnesses:

J. M. IRELAND, L. L. REYNOLDS.

